Power Steering Assist Fault: Causes, and How to Fix It

If your car suddenly shows a warning that says “Power Steering Assist Fault,” don’t panic. This issue is common in many vehicles and can make steering much harder, especially at low speeds. While it sounds serious, understanding the problem and knowing how to fix it can save you from unnecessary stress. This guide explains what the warning means, what causes it, and how you can solve the problem step by step.

What is Power Steering Assist?

Power steering assist is the system in your car that makes turning the steering wheel easy and smooth. Without it, you’d have to use a lot of strength to steer, especially when driving slowly or parking. In older cars, this system relied on a power steering pump and hydraulic fluid. Newer vehicles use electric power steering, which is controlled by a control module and sensors.

When your car displays a “Power Steering Assist Fault” warning, it means the system isn’t working correctly. This might be due to low power steering fluid, electrical issues, or damaged parts. While your car can still be driven, steering will require much more effort, which can be unsafe in certain situations.

What Does “Power Steering Assist Fault” Feel Like?

When the system isn’t working properly, you’ll notice some or all of these symptoms:

1. Steering Feels Heavy: Turning the steering wheel might feel like a workout, especially when you’re parking or driving slowly. This is one of the most noticeable signs.
2. Dashboard Warning Lights: Modern cars often display warnings like “Power Steering Assist Fault” or show a steering wheel icon on the dashboard.
3. Strange Noises While Turning: If your car has hydraulic power steering, you might hear whining or squealing noises, especially if the power steering fluid is low or the pump is failing.
4. Jerky or Stiff Steering: The wheel may feel like it’s sticking or moving unevenly, which can make driving uncomfortable and dangerous.

Common Causes of a Power Steering Assist Fault

A “Power Steering Assist Fault” warning can have several causes. Here are the most common ones:

1. Low or Leaking Power Steering Fluid: Hydraulic power steering systems need fluid to work. If the power steering fluid level is too low, or if there’s a leak, the system won’t be able to provide proper assistance. Check under your car for puddles or stains that could indicate a leak.
2. Electrical Problems: In electric power steering systems, the control module manages the assist. A weak battery, blown fuse, or damaged wiring can prevent the system from working. For example, if your battery voltage drops suddenly, the power steering might shut down temporarily.
3. Faulty Power Steering Pump or Motor: Hydraulic systems use a power steering pump to circulate the fluid, while electric systems rely on a motor. If either of these components fails, the steering assist will stop working.
4. Sensor or Software Issues: Modern cars have sensors that monitor the steering system. If these sensors malfunction or the software controlling the control module has a glitch, the assist system might turn off as a safety measure.

How to Fix a Power Steering Assist Fault

Fixing this issue depends on what’s causing it. Here’s a step-by-step guide to troubleshoot and resolve the problem:

Step 1: Restart Your Car: Sometimes, simply turning the car off and back on can reset the system. This can clear minor software glitches causing the fault.

Step 2: Check Power Steering Fluid Levels: If your car uses hydraulic steering, locate the power steering fluid reservoir under the hood. Check the fluid level and refill it if it’s low. Use the type recommended in your car’s owner manual. If you see fluid leaking, you’ll need a mechanic to fix the leak.

Step 3: Inspect the Battery and Fuses: For cars with electric power steering, a weak battery can cause the system to fail. Check the battery and charge or replace it if needed. Also, look at the fuse box for any blown fuses related to the power steering system.

Step 4: Use a Diagnostic Scan Tool: You can buy a diagnostic scan tool online or borrow one from an auto parts store. Plug it into your car’s OBD-II port to check for error codes. These codes will tell you what part of the system is malfunctioning, such as the control module, a sensor, or the motor.

Step 5: Replace Faulty Parts: If the power steering pump (for hydraulic systems) or motor (for electric systems) is damaged, you’ll need to replace it. This is a more advanced fix and usually requires professional help.

Step 6: Visit a Mechanic: If none of the above steps work, take your car to a trusted mechanic. They can perform a full diagnosis and repair any underlying issues.

Power Steering Assist Fault in Popular Cars

Some cars are more prone to this issue than others. Here’s a quick overview of common models where this problem shows up:

• Ford Explorer and Fusion: Known for electrical problems and sensor glitches causing the fault.
• Dodge Charger: Often affected by weak batteries or worn-out steering components.
• Ford Escape and Focus: Commonly experience sensor or fluid-related issues.

If you drive one of these cars, make sure to monitor your power steering system closely and act quickly if you notice any warning signs.

How to Prevent Power Steering Problems

Preventing a “Power Steering Assist Fault” is easier than dealing with the consequences. Here are some tips to keep your system in good shape:

1. Check Power Steering Fluid Regularly: If your car uses hydraulic power steering, make it a habit to check the fluid level every few months. Look for signs of leaks and refill the fluid if it’s low.
2. Maintain Your Battery: For cars with electric power steering, a healthy battery is essential. Replace the battery every 3–5 years or as soon as you notice signs of wear.
3. Schedule Regular Maintenance: Ask your mechanic to inspect the steering system during routine checkups. Catching small issues early can save you from expensive repairs later.
4. Avoid Hitting Potholes and Curbs: Driving over rough terrain can damage the steering system, especially the sensors or control module.

FAQs About Power Steering Assist Fault

Can I drive with a Power Steering Assist Fault?

Yes, but it’s not ideal. Steering will be much harder, especially at low speeds, which can make driving in tight spaces or emergencies unsafe.

How much does it cost to fix this problem?

The cost depends on the cause. Adding fluid might cost less than $20, but replacing a pump or motor can cost anywhere from $400 to $1,000 or more.

How long does it take to fix?

Simple fixes like adding fluid or replacing a fuse take under an hour. More complex repairs, like replacing a pump, can take a day or two.

What happens if I ignore this issue?

Ignoring the problem can lead to more serious issues, like complete steering failure or damage to other components, which will be much more expensive to repair.

Final Thoughts

Dealing with a “Power Steering Assist Fault” can be frustrating, but it’s usually fixable. Whether the problem is as simple as adding power steering fluid or as complex as replacing a control module, knowing the warning signs and acting quickly can save you time and money. Regular maintenance is the best way to prevent this problem from happening in the first place.

If you’ve experienced this issue before or have tips for other drivers, let us know in the comments. And remember, safe driving starts with a well-maintained car!

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